một sự cải thiệt công nghệ trong sản xuất ảnh hưởng như thế nào đến sự cân bằng của các dòng luân chuyển trong mô hình cân bằng vật chất

What effect did john hay’s open door policy letters have on the imperial powers of britain, france, germany, russia, and japan? a. it provoked the imperial powers to declare war on the united states. b. it caused the imperial powers to restrict trade in their trade with china. c. it warned the imperial powers that the united states would soon declare war on china. d. it signaled to those powers that the united states would take a larger role in world affairs than before.

How were japan's actions before and during world war 2 compare with germany's actions over the same period

What was the result on the u.s. economy because of the major changes in atlantic shipping prior to and during the war of 1812?